Louis Hernandez has been named president and CEO of Avid Technology, the publicly traded Massachusetts-headquartered maker of the Media Composer editing system and ProTools audio workstation, which are widely used in Hollywood.

Effective Monday, he succeeds Gary Greenfield, who has held the post since December 2007 and will remain on Avid’s board of directors.

Hernandez has been a member of the Avid board since 2008. Most recently, he was also chairman of the board and CEO of Open Solutions, a technology provider to financial institutions that was acquired last month by Fiserv.

Speaking on behalf of Avid’s board, George Billings said in a statement: “As lead director, he spent years developing a deep familiarity with Avid’s customers, markets and products that will allow him to quickly make a positive impact as chief executive.”

Avid also recently hired Jeff Rosica, who came from broadcast equipment manufacturer Grass Valley, where he was executive vp and chief sales and marketing officer. Rosica was named Avid's senior vp worldwide field operations.